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Filter thread/Cokin P?

A bellows lens hood / filter holder should be attached OUTSIDE the lens, NOT screwed into the lens thread! (The lens shade / filter holder should be clamped on the lens on the outside...) The best system is what SINAR uses: an extra bellows as a lens shade, with the ability to dial in flat "blinds" to minimize flare and get maximum contrast.

The way to check if you get cut off with a lens shade is to look through the camera, from the front, at the working aperture, with the shutter open, Look at each corner of the ground glass (from the front of the camera). If you can see each corner clearly there is no cut off. Dont try to look at the groundglass from the rear to check for cut off - the ground glass will fool you.

Filter thread/Cokin P?

I had the same problem and I just bought 40.5-52 stepping ring, I think from Kaiser, Germany. It is not quite top quality, but I never had any problems unscrewing it. And Cokin makes P ring for 52mm diameter. Best regards, www.janez-pelko.com